antipolution system defective

[Killerko]

So, I got a new error.. something about antipolution system defective.
This popped up on the display the first time I started it after I replaced the servo with engine light on dashboard as well.
I did not pay much attention to it at first, thinking it will go away.
But it looks like it's here to stay and it's there everytime I start the car now.
No other noticable issue otherwise, car drives well, no limp mode.. breaks great.. never been in better shape since I bought it lol.

Any idea what this could be related to? I will have to double check if I plugged everything back... maybe I missed something.
I will also check the error codes with pp2000 when I get home.

[Doggy]

The message you have is just the generic engine ecu fault message you get for any error.
It may clear by itself, (if you do a number of 'journeys' without the fault recurring it should go away. 3 or 5 as far as I can remember).
'Journey' means driving the car, stopping, turning everything of for at least 15 minutes so all the ecu's shut down.

Failing that you need a diagnostic session to determine the cause.

[GingerMagic]

Have you double checked your vacuum pipes?

Did you start the engine before reconnecting the vacuum pipes as this would also ping up an EML.

Chances are, as Doggy says, it'll go away on its own unless something is not quite right.

This is a completely generic message, it could even relate to the EGR vacuum system too....

[Killerko]

Ok, I will give it a few more days.. like I said, everything is working so it's not urgent.
But I've checked everything and could not find anything unplugged or anything out of order.
All vacuum pipes seems to be in order and I did not start the car while the servo was being swapped.
I swapped rocker cover seal the day after, but that probably have nothing to do with this.

[frog]

If you have the "Peugeot Planet 2000" (PP2000) software, it will tell you pretty detailed what the engine ECU thinks is going wrong. PP2000 runs on a PC or laptop under Windows (XP). You need a "Lexia cable" (google for it).

[Killerko]

Yeah I got PP2000.. bough the cable on ebay long time ago.. just checked the car today:

So the first two faults I would guess are related to the MAF sensor?
As with other things in this car, the sensor has a cable tie around it, which suggest something is very sus with it..
Once cable tie was removed, it kinda fell apart so I put it back together and returned the cable tie back for now.
I can try to replace it with the MAF from my other 406 but that one might not be good either.

As for the other 3 faults, any idea what connector/sensor are they referring to?
Gas accelerator cable also got 2 cable ties around it as well and turbo I have no idea what connector/sensor is this reffering to..

[GingerMagic]

You are right - the top one is a permanent fault so this is currently your issue with your anti pollution fault.

The rest are intermittent so could be really old faults - I would clear them all and see what comes back next time you go for a drive.

I'd the fault states 'open circuit' then it's a wiring issue - either it isn't or wasn't connected property at some point, or the sensor is toast.

Both the MAF sensor and the throttle position sensor can be cleaned out to see if this helps - the MAF sensor is very fragile inside but the throttle position sensor is more robust. You can also do a reset for this sensor - PP2000 will tell you if this sensor is giving false readings, along with the MAF sensor readings.

Both are in the Engine ECU - Parameters menu if I remember correctly.

[frog]

As for the other 3 faults, any idea what connector/sensor are they referring to?

Turbo pressure sensor is the tiny thing on a small tube connected to the big pressurized air pipe:

Boost pressure sensor location.jpg

(142.77 KiB) Not downloaded yet

Accelerator pedal sensor you seem to have already found, it is next to the MAF sensor.

[Killerko]

So, replaced the dodgy MAF from my other 406, cleared all the errors and went for a drive.
Antipollution error seems to be gone as well as the engine icon.
If it won't come back we good here.. but considering it came back 100% of the time before I would assume this is now sorted.

Cable ties are like an identifier of all the faults in my car

[GingerMagic]

Was there a cable tie on your servo..... ?

[Doggy]

Sounds like a good result, well done.

[Killerko]

GingerMagic: Yep.. as you can see here:


I have rechecked the errors in PP2000 and the permanent fault is back, but only in PP2000..
there is nothing on dashboard or display. As this would pass MOT, I am not too much bothered with it... but still, wonder why it came back.
I will be ordering a new MAF sensor anyway for the other 406, so I can try to put the new one there if that will make any difference.

[GingerMagic]

I knew it.... !!

Your MAF is either recording a low airflow and isn't faulty, or your EGR is stuck slightly open so some of the 'expected' airflow is being lost through it

It could also be a coherence issue between the MAF and the MAP sensor ( the one in Frogs picture ) as they work together to determine how much boost and how much airflow - if either one is duff then the readings will be over/under what the other sensor is expecting....

A new MAF isn't too expensive, there are always online offers with GSF, Carparts4less etc etc
Try to go genuine as the eBay specials are a bit hit and miss for quality.

[Killerko]

Thanks Ginger, that was very helpful.. I cleaned the EGR valve today as you suggested as that do not cost anything.
Not sure if it will do anything tho.. it was quite a pain to get it out from behind the engine.. and then back again.

I will check the PP2k tomorrow and if we assume the MAF is not faulty and just recording correct value, that leaves only the MAP sensor to replace then.






There was also some liquid when I disconnected the hose (the silver pipe in the middle).. not much, not even sure what it was

[GingerMagic]

As you can see by your EGRs before and after pictures, that there is a reason why many of us choose to blank it - it stops the engine breathing in its own soot and the valve itself getting gummed up and not opening/closing properly.

It's a pig to get to, but as you say all it costs is a little time and patience.

Take the car for a spin and see what PP2K says about it.